Press



Oct. 13, 1959 L. G. EHMANN PRESS Filed Oct. 17, 1955 2 Sheets-Sheet 1} m Y B G 27 IN V EN TOR.

as a ATTORNEYS.

-| G. EHMANN PRESS Oct. 1 3, 1959 2 Sheets-Sheet 2 Filed Oct. 17, 1955 INVENTOR.

Qfimm aw y w; ATTORNEYS.

United States Patent PitEsS I I Leslie Ehmann, ronlsnd, or .,jas i n r to Electric Stel Foundry Company, P'ortland,. Greg, 2- corporation of Oregon Application octoher 17, 1955', No. 540,882 4 claims. or. tot m),

"this invention rel-ates to a press, and more particularly to a hydraulic ty e press adapted to receive dies,eic.

object of the present invention is to provide a press of small and compact arrangement wherein a rash acting operation can he carried on with low hydraulic pressu e and through the use of small cylinders. A for:

" 23 and isoh which arepin 29 extends through 217 Patented Oct. 13, 1959" 2 suspended hydraulic Cylinders 7 cylinder I provide a-division wall" 27. The cylinders- 23 and 26 are provided each with hpwardlyextendin spaced cars 28,. a piv t the earsz's and the-Web mem- 25 "5116261 Between the hers 23 and 24 as well as through the partition wall 27'.

ther object is to provide a ress wherein com lete access is provided to the die area and to the dies while at the same time providing the workin'g paris ofthepr'ess with in ver small compass. A still further opject is to pro= vide a press of unique constrnctionirl whichthe power cylinders are lions-ed 'within the' base" of the press and in which the case top provides a fixed ia w orjaw sp 'e port for dies while also suspending power within the base for the actuation of a rocker -rm can-pings movable jaw ada ted to receive dies. Yet another olr-f ject is to rovide a hollow 'hase having a top wall ro-- viding a support ror suspending powernnits within the base coasting with to gle levers for the moving or a rocker earrying a forwardiy-extendlngnlovahle jaw adapted to receive dies or enacting with dies carried by the base top, the. motor and pump beingcarried by a side wall of the ease. other specific ohjects' and advantages vvill appear as the specification proceeds.

The invention is shown, in an illustrative embodiment,

by the accompanying drawings, in'which Figure 1 is a' front elevational view of a press enihod 'ing my invention; Fig. 2, an enlarged vertical-sectiohalview, the section being taken as indicated at line 2-2 of Fig. 1; Fig. 3, a horizontal sectional view, the section being taken as indicated at line 33 of Fig. 2; and Fig. 4, a sectional detail View, the section being taken as indicated at line 44 of Fig. 2.

In the illustration given, A designates a hollow base having a top wall A. The base A has a closed front forward wall 10, and closed side walls 11 'and 12. The rear wall of the base is open at 13, as shown best in Fig. 3. The top wall A is provided along its rear side with three spaced upwardly-extending arms '14, 15 and 16, which are centrally apertured to receive a pivot pin 17.

A rocker arm B is provided with depending spaced flanges 18 and 19 received between the arms 14, 15 and 16, as shown best in Fig. 4, and the flanges 18 and 19 are also apertured to receive the pivot pin 17. The rocker arm B has afor-wardlycxtending movable jaw 20, adapted to have secured thereto a top die 21 opposed to the die 22 resting upon the forward portion of the base top wall A which, in effect, constitutes a fixed jaw. The dies 21 and 22 can be seen in Figs. 1 and 2 to be contoured to perform a swaging operation on a metal sleeve such as used in securing the end of a wire rope in forming an eye splice or the like.

I employ the inner chamber of the base casing as a means for housing the working parts of the press, and the operator is shielded from such parts by the front wall 10 of easing A. The top wall A, as shown best in Figs. 2 and 4, is provided with depending web portions The cylinders 25 and 26 are each provided with a. piston stem 3?) extending downwardly from the closure plate 31 of the cylinder. Within each cylinder is the usual pistonand communicating with the ends of the cylinder are denihle condttits' not shown) tor supplying pressure fluid to the cylinders. Since such structures are well known, a detailed description herein is believed unnecessary. I

The ower piston stein 30 extending from each of'the cylinders is provided at its lower end with a sleeve socket 32 engaging a pivot pin33. Each pivot pin 33 connects a'pair of toggle links or. toggle levers 34 and 35, which maybe of suitable type or construction. Each inner to gle lever 34 is connected at one end to the front wall 10 or the casing A by eans of an elongated pivot pin 36. As hown bestin Fig. 3, the well ill -is provided with a of inwardlyrextending flanges 37 on each side of the partition wall 27, and the; lever 34 is rovided with three rearwardlwextendihg fingers 38 receivin the flanges 3'7 and pivotally supported thereon by the pin as. Each of the toggle levers 34 is rovided with a solidlhase portion and with upwardly-extending side nib portions 39. At its other end, each lever 34 is provided with enter flanges 40' apertured to receive the pin 33 and also to receive therehetwee'n the spaced flanges 41 of the lever 3 I j Each ofthele'vers 35' has also a solid base portion and upwardly extending" reinforcing ribs 42. At its outer end, each lever 35. has apair of spaced flanges 43 aperru'red to receive the pivot pin 44 carried by the de endihg arm 15 of the rocke B. i

Suspended upon one side wall of the casing A is the motorflfiwhich drives through the belt 47 the pump 4?. Suitable controls for the operation of the motor. and the pumpare rovided at the front of the ress, and since such structure are well known, herein believed nnnecessery.

Operation In the operation of the press, the parts are normally maintained in the position illustrated in Figs. 1 and 2, with the rocker arm in the open position providing free access to the die area at the front of the press. The dies 21 and 22 may be anchored in position and this area is open for inspection and ready change of the die parts therein. After the work has been placed upon the dies, the pressure fluid is supplied to the top of the cylinders 25 and 26 and the pistons therein are moved downwardly, the stems 30 of the pistons pressing the toggle links 34 and 35 to their lower position, as illustrated in dotted lines in Fig. 2, thus swinging the rocker ann upon pivot 17 forwardly to the position indicated in dotted lines in Fig. 2. In the latter position, it will be observed that the pressure exerted by the pressure fluid downwardly against the pistons and equally, therefore, upwardly against the wall A, is counteracted by the downward pressure of the movable jaw 20 through the die parts. 21 and 22. The toggle levers 35 operate through the rear open wall of the housing A, but are shielded from the front and sides by the walls 10, 11 and 12. By incorporating the cylinders and toggle levers within the base housing and by mounting the hydraulic supply on the side of the base, using multiple shear on the main rocker pin and toggles, an extremely small and compact press is achieved and in which the hydraulic pressure is low in ratio to the high die pressure attained by the use of the toggle action and leverage a detailed description.

the spirit of my inventions;

of the rocker arm: Very small pressure cylinders'm'ay thus be employed,with low hydraulic pressure and high die pressure attained 'by the toggle action and rocker arm leverage. The open jaw type design shown provides complete access to the die area and dies, thus adding to the larger output of work; i :The structure illustrated is substantially a one-piec'efunit and provides for fast-acting work output. The top Wall of the housing not only provides the fixed jaw or die support, but also provides the suspension means for the power cylinders within the' housing- H While, in the foregoing specification, I have set out specific structures in considerable detail for the purpose ofillustrating an embodiment of the invention, itwill be understood that such details of structure may be'yaried widely by those skilled in the art without departing from I claim: p I i 1.. Ina press, a generally rectangular vertical hollow base having at least one open, vertically extending narrow side and vertically extending widesides, a t fixed jaw carried in the upper portion of said base between the vertically extending wide sides, a pivot pin supported in the upper portion of said base adjacent the said open side, a rocker arm pivotally carried intermediate the ends thereof by said pin and provided at oneend witha jaw movable with the upper portion of said rocker arm toward said fixed jaw, said rocker arm having an integral depending arm portion extending downwardly along said open side of said base to substantially the bottom end of said base, a cylinder pivot pin within said hollow base and in thecentral upper portion thereof, a pressure-fluid, piston-equipped cylinder suspended upon said cylinder pivot pin and having a piston stem extending downwardly within said base, and a' pair of toggle links each having one end pivotally connected together in the bottom portion of said base, one link being pivotally connected at its other end to the lower portion of said baseremote from said open side and the other link being connected at its other end to the lower end of said depending rocker arm, the piston stem of said cyclinder being connected to said toggle links adjacent their point of pivotal connection. i

2. The structure of claim 1 in which said base and rocker armare each equipped with a plurality of spacedapart projections, each projection being equipped with an aperture with the apertures aligned and supporting the first-mentioned pivot pin, the rocker arm projections 7 being positionedrbetwee n the base projections to develop multiple shear on said first-mentioned pivot pin.

3. The structure of claim 1 in which the rocker arm pivot pin is spaced more closely to the movab le'jaw end of said rocker arm than to the end of said rocker arm connected to said toggle links, said rocker arm being generally arcuate to provide portions thereof between said rocker arm pivot pin and said 'movable jaw end and between said rocker arm pivot pin andthe toggle link-connected end that are in angled relation to each otherand to provide'a =multiplying=leverage while still maintaining the base and rocker arm inacompact space. i

4. In a press having a generally rectangular vertical hollow base having at least; one open, vertically-extending narrow side and vertically-extending wide sides, said base carrying a fixed jawin the upper portion thereof between the vertically-extending wide sides, a cylinder pivot pin supported within said base in the central upper por- V. 'tion of said base and spaced laterally of said fixed jaw,

a rocker arm pivot pin supported also in the upper portion of said base adjacent said 'open side, a pair of pressurefluid, piston-equipped cylinders suspended upon said cylinder pivot pin, each cylinder having a piston stem exlinks in the bottom portion of said base for each cylinder, the links of each pair being pivotally connected together and to the piston stem of one of said cylinders, one of the links of each pair being pivotally mounted upon a pin carried in the lower portion of said base adjacent the side opposite the said openside'and the other of the links in each pair having an end portion extending toward the open side of said base, a rocker arm pivotally carried said rocker arm pivot pin and provided at its top'with a jaw movable with said arm toward said fixed jaw :for vertical pressing action, and having a depending arm extending downwardly along said open sideof said base and connected at its bottom to the end of the links in each pair extending toward said open side, and a verticalwall internally of said base between said cylinders,

References Cited in the file of this patent UNITED STATES PATENTS Cleghorni u JunelO, 1941 

